If gothic letters are <#400#>necessary<#400#>, please use those of the
relevant AMS-TEX<#401#><#401#> alphabet which are available from the
American Mathematical Society.
In LATEX<#402#><#402#> only the following gothic letters are
available: 79 yields ℜ and 80 yields ℑ.
These should <#403#>not<#403#> be used when you need gothic letters for your
contribution. Use AMS-TEX<#404#><#404#> gothic as explained above.
For the real and the imaginary parts of a complex number within math mode
you should use instead: 81 (which yields Re) or
82 (which yields Im).